add LSM6DSO (#2388)

docs/extensions.md

@@ -342,6 +342,10 @@ Check out [microbit.org](http://microbit.org/resellers/) for more information on
     "url": "/pkg/rebeccaclavier/pxt-bmp280",
     "cardType": "package"
 }, {
+    "name": "LSM6DSO Accelerometer/Gyroscope",
+    "url": "/pkg/makecode-extensions/LSM6DSO",
+    "cardType": "package"
+}, {    
     "name": "LPS22 Pressure",
     "url": "/pkg/makecode-extensions/LPS22",
     "cardType": "package"

targetconfig.json

@@ -136,6 +136,7 @@
             "4tronix/MiniBit",
             "elecfreaks/pxt-wukong",
             "rebeccaclavier/pxt-bmp280",
+            "makecode-extensions/LSM6DSO",
             "makecode-extensions/LPS22",
             "makecode-extensions/LIS2DW12",
             "makecode-extensions/LIS2MDL",